The Working Principle and Process of Disc Filters for Drip Irrigation

Working Principle of Disc Filter for Drip Irrigation

The disc filter for drip irrigation is composed of parallel-filtering units, and each filtering unit mainly consists of a set of annular reinforced plastic filter discs with grooves or ribs. During filtration, wastewater enters from the outside, and the edges formed by the grooves on adjacent filter discs capture solid particles from the water. During backwash, water flows from inside the annular filter discs to the outside, flushing the trapped debris off the discs, which are then expelled through a drainage outlet. The discs are tightly compacted and stacked together within the unit, with the grooves between the top and bottom layers acting as a filtering barrier. Raw water flows through the filtering unit from the outside to the inside, where impurities larger than the grooves are captured externally.

Filtration Process of Disc Filter for Drip Irrigation

1. The wastewater to be treated enters the filtering unit through the inlet;

2. The flow moves from the outer side of the filter disc group to the inner side;

3. As the flow passes through the channels formed by the annular ribs, particles larger than the rib height are intercepted and stored in the spaces created by the curved ribs and the gap between the filter disc group and the housing;

4. The filtered clean water enters the inside of the annular filter discs and is discharged through the outlet.

Backwash Process of Disc Filter for Drip Irrigation

When the filtration resistance increases or the set operation time is reached, the disc filter for drip irrigation begins its backwash process. At this time, water flows from the center to the outer edge, water pressure overcomes the spring tension, the discs loosen, and sediment is flushed away.

1. The controller sends a pulse signal, and the solenoid valve opens, directing water flow through the solenoid valve to the backwash valve;

2. The backwash valve operates, closing the inlet and opening the drain outlet;

3. Clean water enters the interior of the filter disc group from the outlet of the filtering unit;

4. Pressurized clean water flows in the reverse direction of the working process through the filter disc group, flushing out debris trapped between the discs;

5. The flushing water is expelled through the drainage pipe.

The filter discs of the disc filter for drip irrigation have a unique structure, making the backwash process to flush out debris simpler and easier without the need for complex motors and actuators; simple water flow is sufficient to flush out debris from the filter core. This superior performance reduces the backwash time of the filter. Additionally, since debris is stored not only between the filter disc group and the housing but also more within the filter disc group, the filter can accommodate more debris.

The disc filter for drip irrigation can largely replace traditional mechanical filtration devices such as sand filters, with superior performance and much lower water and electricity consumption compared to other products.